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Transactional Email Software · Rank #4 of 10

Mailgun review and pricing

Original developer-API transactional email; multi-region delivery infrastructure.

By Sinch (NYSE: SINCH) · Founded 2010 · San Antonio, TX · public

Mailgun was one of the original developer-API transactional email services, founded in 2010 and acquired by Rackspace, then spun out, then acquired by Sinch (Swedish CPaaS, NYSE: SINCH) in 2021. The product is mature: HTTP API, SMTP relay, tag-based analytics, US and EU regional infrastructure, and a long-tail SDK ecosystem. The position has softened since the Sinch acquisition: pricing has crept up on lower tiers, the free tier is now restricted to a 30-day trial (not permanent), and dev mindshare for new projects has migrated to Postmark and Resend.

Visit Mailgun Vendor pricing Compare to Resend
Best for

Established Mailgun deployments and teams that need US + EU regional sending with tag-based analytics on a mature SDK.

Worst for

New dev-team greenfield projects (Postmark or Resend now dominate that mindshare) and cost-driven high-volume senders (AWS SES wins).

Vendor Trust Score

Is Mailgun a trustworthy vendor?

7.1/10
Mixed
Pricing transparency
Published rates; no hidden fees
7.5
Contract fairness
Reasonable terms; no auto-renew traps
7.0
Incident response
How they handle outages and breaches
7.5
Post-acquisition behavior
Customer treatment after M&A or PE
6.5
Executive stability
Leadership churn over 24 months
7.0
Roadmap honesty
Public commitments held
7.0
Trust signal log
  • 2021-02-08
    Acquired by Sinch for $48.6M cash + ~$3B in shares
  • 2022-06-01
    Free tier converted to 30-day trial
  • 2024-09-12
    Pricing increases observed on lower tiers under Sinch ownership
Vendor Trust is scored independently of product quality. A great product from an unfair vendor still earns a low trust score.
Review Intelligence

What 380 reviews actually say

Synthesized from G2, Capterra, Reddit, Trustpilot. Patterns >15% prevalence shown.

Last synthesized
2026-04-29

Praise patterns

  • Mature US and EU regional sending infrastructure
    71% →
  • Tag-based analytics genuinely useful
    54% →
  • Long-tail SDK ecosystem
    47% →

Complaint patterns

  • Free tier converted to 30-day trial felt punitive
    51% →
  • Pricing has crept up under Sinch ownership
    47% ↑
  • Support response times degraded vs 2018-2020 baseline
    41% ↑
Sentiment trend (6 months)
76/100 0 pts
11
12
01
02
03
04
Patterns are extracted from review corpus and human-verified. We surface trends, not anecdotes.
Verified Pricing

What buyers actually pay

124 anonymized deal disclosures · last updated 2026-04-30

Contribute your deal price
Company size Median annual
50K–300K emails/month $600
300K–1M emails/month $2,400
1M+ emails/month $12,000
Verified pricing is crowdsourced from buyers under anonymity guarantees. Vendor-listed prices are validated against actual deals quarterly.
Compliance & Security

Auto-verified certifications

Verified 2026-04-15
SOC 2 Type II
ISO 27001
HIPAA
GDPR
CCPA
PCI DSS
FedRAMP

Editorial: Strengths

  • US and EU regional sending infrastructure (GDPR data residency option)
  • Tag-based analytics with per-tag delivery and engagement metrics
  • Validations API for list cleaning (separate add-on)
  • Mature HTTP API and SMTP relay since 2010
  • Multi-region failover and queue handling
  • Reasonable documentation and SDK coverage

Editorial: Weaknesses

  • Free tier converted to a 30-day trial in 2022 (no longer permanent free)
  • Pricing has crept up on lower tiers under Sinch ownership
  • Dev mindshare for new projects has migrated away
  • Support response times have degraded vs the 2018-2020 baseline per recent reviews
  • Validations API adds meaningful cost on top of sending

Key features & integrations

  • +HTTP API and SMTP relay
  • +US and EU regional sending
  • +Tag-based analytics
  • +Validations API (separate add-on)
  • +Inbound routing and parsing
  • +Suppression management
  • +Multi-region failover
  • +Detailed event logs
60+ integrations
ZapierSegmentDatadogSlackWordPressSinch Engage
Geography supported
Global; US + EU regional infrastructure
Best fit
5–5,000 employees · Mid-market and enterprise; dev-API consumers
Editorial deep-dive

Read our full ranking of Transactional Email Software

Mailgun ranks #4 in our editorial review of 10 transactional email software platforms. The deep-dive covers methodology, comparison tables, decision matrix, migration scoring, and FAQs.

Read the full ranking

Closest alternatives in Transactional Email Software

#3
Resend
Modern transactional email built for React, Next.js, and the TypeScript stack.
★ 4.7 public
#5
AWS SES
Cheapest-at-scale transactional email; you bring your own deliverability discipline.
★ 4.4 public
#2
Postmark
Transactional-only by design. Deliverability is the product.
★ 4.7 public
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